How can I install my iOS update

To see which model iPhone you have, select Settings > General > About. That screen will display the

• iOS version,
• model name and
• model version.

Please let us know what that says on your iPhone.

how?

You donload it and doesnt install ?

or it cannot download anymore?

Please provide more information. Which iPhone do you have? What is its current iOS? What happens if you tap Install?